The adduct between <i>IF</i><sub>7</sub> and <i>AsF</i><sub>5</sub> has been shown to be ionic and consist of IF<sub>6</sub><sup>+</sup> and AsF<sub>6</sub><sup>−</sup> ions. The environment of these ions appears to be octahedral. Based on this symmetry, force constants have been determined. Some controversy regarding the frequency position of the ν<sub>4</sub> (<i>F</i><sub>1<i>u</i></sub>) vibration, and the assignment for the ν<sub>1</sub> (<i>A</i><sub>1<i>g</i></sub>), ν<sub>2</sub> (<i>E</i><sub>g</sub>) vibrations in <i>IF</i><sub>6</sub><sup>+</sup> has existed. However, the proper ν<sub>4</sub> assignment was eventually made, and Raman studies of <i>IF</i><sub>6</sub><sup>+</sup><i>AsF</i><sub>6</sub><sup>−</sup> in <i>HF</i> solutions clearly indicated that the lower frequency band at 711 cm<sup>−1</sup> was polarized. Thus, the depolarized 732 cm<sup>−1</sup> vibration was assigned as the ν<sub>2</sub> (<i>Eg</i>) mode. Recently, <i>IF</i><sub>6</sub><sup>+</sup><i>SbF</i><sub>6</sub><sup>−</sup> has been prepared and the vibration spectrum analyzed. The results support previous assignments of Christe and Sawodny and verify the ν<sub>4</sub> assignment.

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